Abstract
In terms of operating frequency, the wireless communication systems can be divided into three main blocks: radio frequency band (RF), intermediate frequency band (IF), and Base Band, respectively. In general, the circuits operating at IF and Base Band are fabricated and designed in digital by CMOS process, but those of RF must be fabricated and designed in analog by GaAs Process. Besides, for impedance matching, the circuit leads inductors in design, but inductors are not appropriate to be used in CMOS process because the loss of substrate of CMOS process inherently is considerable and thus quality factor of inductor is low, and the Spice models form different foundries are different. So the accurate Spice models of active and passive components are very important in design. To integrate the three blocks, the cost of manufacture, power consumption, and chip size are reduced. Besides, the systems made by the same CMOS process facilitate to modify and integrate other digital systems. It makes mobile phone, personal digital assistant, and notebook more compact and portable. Thus it speeds the production and affects the PC and relative industries very deeply. So accompanied with that the market of wireless communication systems is dramatically growing, the research of RF ICs is very hot. The development of CMOS RFIC Design lets the fabrication of System On Chip (SOC) consisting of three blocks: radio frequency (RF), intermediate frequency (IF), and base band frequency realizable; therefore, it reduces considerably the cost and speeds mass production. In this thesis, the design and implementation of 1.5V 1.95GHz Variable Gain Low Noise Amplifier (VGLNA) and Gilbert Mixer (GM) by TSMC (Taiwan Semiconductors Manufacture Company) 0.35 um CMOS process are presented. There are three operating mode of the VGLNA: high gain (28.5dB), medium gain (23.5dB), and low gain (18.5dB) with noise figure all less than 3 dB. The Gilbert Mixer is also operating in 1.5V 1.95GHz with conversion gain 9 dB, noise figure 11.4 dB, and isolation greater than 30dB. It converts down the RF signal 1.95GHz of VGLNA to IF signal 100MHz. The total chip area is 1434 x 1465 um2. The chip can be applied in increase the dynamic range of mixer and power control. The measurement of the VGLNA shows 13.5 dB, 3.1, -4.2 dB gain and 6.83 dB, 9.93 dB, 14.3 dB noise figure with 43.5 mW power consumption in three modes. The measurement of the Gilbert mixer presents 2.7 dB conversion gain, 5 dBm IIP3, 4 dBm OIP3 with 27 mW power consumption. The measurement of the chip shows that the function behavior of the VGLNA and Gilbert mixer is carried out.